Summary
Cerebral ischemia activates the production of both endogenous and exogenous mediators of the inflammatory response. Using the middle cerebral artery occlusion suture model in the rat, we have found that occlusion followed by reperfusion leads to a remarkable induction of cyclo-oxygenase (COX) 2, both in the infarcted area and in the penumbra, occurring 6h after 2h of ischemia followed by 3h of reperfusion. COX-1, the constitutive enzyme, does not display changes under these conditions. Recent studies in our laboratory have also shown that in a kainic acid induced brain damage model COX-2 induction occurs at the transcriptional level, since nuclear runs on assays in isolated nuclei from the hippocampus as a function of time after injury matched the profile of changes in COX-2 mRNA abundance. Moreover, plateletactivating factor (PAF) is an activator of COX-2 transcription in transfected cells, and PAF antagonists in vivo block the injury-induced COX-2 expression. Therefore phospholipase A2 activation and PAF generation in cerebral ischemia link the formation of prostaglandins through COX-2 induction. These signaling pathways may be transneuronally controlled through excitatory amino acid neurotransmitters. It is hypothesized that phospholipase A2 activation, PAF accumulation, and COX-2 induction are reduced during the development of enhanced tolerance to ischemic injury.
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© 1997 Springer-Verlag Berlin Heidelberg
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Bazan, N.G. (1997). Synaptic Messengers, Inflammatory Mediators, and Neuronal Plasticity in Cerebral Ischemia. In: Ito, U., Kirino, T., Kuroiwa, T., Klatzo, I. (eds) Maturation Phenomenon in Cerebral Ischemia II. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60546-8_3
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DOI: https://doi.org/10.1007/978-3-642-60546-8_3
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